I believe it is a tetradecagon.
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Tetradecagon
The interior angles of a 14 sided polygon add up to 2160 degrees
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon